the.com/tube
a shape so simple it carries your blood, your toothpaste, and your trains underground
london nicknamethe world's first underground railway, opened 1863
vacuum originsearly computers ran on glowing glass tubes
hollow strengthtubes resist bending better than solid rods of equal weight
inner tubeonce kept tires inflated, now floats lazy rivers
youtube echothe name nods to old slang for television